OAuth2 returns 403 Forbidden on sending request

hello there, i have just created a developer account and made a application there. after that i used the app id provided by that app to make authorization but i got forbidden response. What might be the error.

Good morning Sharad,

Since you created a developer account I’m assuming that you are using our OAuth2 authorization flow to access the API which is a standard three-leg authorization flow, not a single API key to use. You can find full details on our developer site for implementation:


Hi Tom,

I hope this message finds you well. I appreciate your prompt response. My name is Sharad Bhandari, and I am reaching out on behalf of Krispcall, a VoIP telephony SaaS provider.

We have been diligently working on the development of an integration module designed to seamlessly integrate with Keap. Over the past few weeks, I have been thoroughly exploring your developer documentation to ensure a smooth integration process.

To further enhance our understanding and discuss the implementation of every available feature in the CRM, we would greatly appreciate a technical demonstration or a meeting with the Keap teams. Could you please share your calendar availability so that we can schedule a convenient time for this discussion?

Your assistance in coordinating this would be highly valuable, and we look forward to the opportunity to collaborate with Keap for a successful integration.

Thank you for your time, and I’m eager to hear from you soon.

Best regards,

Er. Sharad Bhandari

Software Engineer

Krispcall Pte. Ltd.

My apologies, but we do not provide solutions engineering meetings at this time. Our documentation is available at https://developer.infusionsoft.com for your perusal.